Oilproof and greaseproof paper can



T. M. GODFREY. OILPROOF AND GREASEPROOF PAPER CAN.

APPLICATION HLED OCT. 1, I918- I Psitented Nov. 1, 1921.

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. oil-proof UNITED STATES PATENT OFFICE.

TRUMAN M. GODFREY, OF CHICAGO,

OIL COMPANY, OF NEW YORK,

OILPROOF AND GR-EASEPROOF PAPER CAN.

Specification of Letters Patent.

Patented Nov; 1, 1921.

Application filed October 1, 1918. Serial No. 256,448.

To all whom it may concern:

Be it known that I, TRUMAN M. GODFREY, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Oilproof and Greaseproof Paper Cans; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to certain new and useful improvements in paper cans and like containers for substances of an oily or greasy character, and is intended to provide a paper can or container which is made or grease-proof by lining it interiorly with a substance which penetrates the paper to some extent and which is flexible (in the sense that it will not crack or check during any normal use to which the can may be subjected), and which is practically odorless and of a nature which will not injure the fat with which it is in contact.

As an example of the application of my invention, I have illustrated in the accompanying drawing, one form of container which is interiorly coated as described in this application. In the drawing,

Figure 1 is an illustration of the container with a portion thereof broken away; and

Fig. 2 is an enlarged detail in section of the wall of the container.

It is to be understood that the illustration is not intended to limit my invention to the particular form of container shown, the invention being equally applicable to other containers wlthin the scope of the accompanying claims.

To this end, the coating consists of an adhesive substance, soluble 1n water and miscible when in water solution with glycerin, the composition thus made up being of a character to not only adhere to the interior surfaces of the paper container, but also to penetrate and fill the pores of the paper for a sufiicient distance to anchor the resulting lining in place, while leaving a substantial body of the material as a surface film covering the entire periphery that is to be exposed to the oil or grease. Furthermore, when set, the coating. forms a continuous film or layer of the coating material over the ;-e"ipher v of the container so as to exclude the penetration of the oil or grease into the body portion of the protected paper.

In the practical carrying out ofthe invention, the adhesive employed may be, for instance, gum arabic, dextrin, glue or gelatin, casein or the like, associated with water and glycerin, to which, when casein is employed, a proportion of ammonium hydrate may be added. 4

When gum arabic is employed as the adhesive, it will be suitable to employ 50 parts by weight of gum arabic, 135 parts by weight of water and 25 parts by Wei ht of glycerin; this solution should be appIied warm, for

the reason that it penetrates more readily and is somewhat more fluid when warm.

When dextrin is employed as the adhesive it will be suitable to employ 200 parts by weight of dextrin, water, and 40 parts by weight of glycerin. When glue or gelatin is employed as the adhesive, it will be suitable to employ 10 parts by weight of glue or gelatin, 42 parts by 150 parts by weight of weight of water and 7 parts by weight of glycerin. When casein adhesive, it will be suitable to employ 10 parts by weight of casein, 100' parts by weight of water, 10 parts by weight of glycerin, and to add from 5 to 10 parts by weight of ammonium hydrate (NH OH) of a specific gravity of 0.90.

It will, of course be understood that the proportions of these various constituents may vary somewhat without materiall affecting the grease-proof properties of the solution. In practice, it will be found appropriate and in many instances necessary to apply two coats of any of these solutions, for the reason that there are apt to be, small air bubbles, resulting in minute or pin-hole openings in a single coat which would permit the oil or grease to slowly leak through,

whereas the application of a second coating.

Is employed as the much whiter finish upon the paper (even though it be a poor grade of paper) than would the gum arabic solution or the gelatin solution if used alone, while the use of the gum arabic solution or the gelatin solution to form a top coating makes it possible to use container which, in the present instance, is

cylindrical in form and is provided with a cap or closure 6. The container is constructed of paper and may, for example, be provided with double walls 7 which are suitably secured together. The exact form and construction of the container forms no part of my present invention, which, as above indicated relates to the coating thereof to render the paper impervious to substances of an oily or greasy character. The coating 8 is of the character above described and is applied in any suitable manner to accomplish the desired purpose.

particularly, they may serve as receptacles for edible products of an oily or greasy character, such as edible vegetable and animal oils and greases, both of liquid and nonliquid consistency, for which employment. they are notably adapted.

hat I claim is:

A paper container having an inner coating produced by the application thereto first of glycerin, water, and casein, and secondly, of glycerin, water and an adhesive soluble in water and of a character to mask any objectionable odor of the casein employed in the first coating; substantially as and for the purposes described.

In testimony whereof I affix my signature.

TRUMAN M. GODFREY. 

